Version 3 resource packs have to use lowercase filenames for everything.

Entity IDs, block entity IDs, block IDs and item IDs

Now are no longer case sensitive.

Autocomplete will put in lowercase letters.

Entity and block entity IDs

Use underscores to separate words, rather than using single words in mixed case.

Optionally, a minecraft: namespace prefix can be used, just like block and item IDs. However, it is not optional for EntityTags and spawners.[3]

There are still old entity IDs in the language files (example: LavaSlime instead of magma_cube for the magma cube) and the new mobs in 1.11 have their ID with the old type (no underscores, capital letters for the beginning of the words. example: VindicationIllager instead of vindication_illager for the vindicator.)

The following names have changed:

Old name

New name

Change

Type

AreaEffectCloud

area_effect_cloud

Underscores

Entity

ArmorStand

armor_stand

Underscores

Entity

Cauldron

brewing_stand

Rename

Block entity

CaveSpider

cave_spider

Underscores

Entity

MinecartChest

chest_minecart

Rename

Entity

Control

command_block

Rename

Block entity

MinecartCommandBlock

commandblock_minecart

Rename

Entity

DLDetector

daylight_detector

Rename

Block entity

Trap

dispenser

Rename

Block entity

DragonFireball

dragon_fireball

Underscores

Entity

ThrownEgg

egg

Rename

Entity

EnchantTable

enchanting_table

Rename

Block entity

EndGateway

end_gateway

Underscore

Block entity

AirPortal

end_portal

Rename

Block entity

EnderChest

ender_chest

Underscore

Block entity

EnderCrystal

ender_crystal

Underscores

Entity

EnderDragon

ender_dragon

Underscores

Entity

ThrownEnderpearl

ender_pearl

Rename

Entity

EyeOfEnderSignal

eye_of_ender_signal

Underscores

Entity

FallingSand

falling_block

Rename

Entity

FireworksRocketEntity

fireworks_rocket

Rename

Entity

FlowerPot

flower_pot

Underscore

Block entity

MinecartFurnace

furnace_minecart

Rename

Entity

MinecartHopper

hopper_minecart

Rename

Entity

EntityHorse

horse

Rename

Entity

ItemFrame

item_frame

Underscores

Entity

RecordPlayer

jukebox

Rename

Block entity

LeashKnot

leash_knot

Underscores

Entity

LightningBolt

lightning_bolt

Underscores

Entity

LavaSlime

magma_cube

Rename

Entity

MinecartRideable

minecart

Rename

Entity

MobSpawner

mob_spawner

Underscore

Block entity

MushroomCow

mooshroom

Rename

Entity

Music

noteblock

Rename

Block entity

Ozelot

ocelot

Rename

Entity

PolarBear

polar_bear

Underscores

Entity

ShulkerBullet

shulker_bullet

Underscores

Entity

SmallFireball

small_fireball

Underscores

Entity

SpectralArrow

spectral_arrow

Underscores

Entity

ThrownPotion

potion

Rename

Entity

MinecartSpawner

spawner_minecart

Rename

Entity

Structure

structure_block

Rename

Block entity

PrimedTnt

tnt

Rename

Entity

MinecartTNT

tnt_minecart

Rename

Entity

VillagerGolem

villager_golem

Underscores

Entity

WitherBoss

wither

Rename

Entity

WitherSkull

wither_skull

Underscores

Entity

ThrownExpBottle

xp_bottle

Rename

Entity

XPOrb

xp_orb

Underscores

Entity

PigZombie

zombie_pigman

Rename

Entity

Horse was split into entity IDs horse, donkey, mule, skeleton_horse and zombie_horse for their respective types.

Skeleton was split into entity IDs skeleton, stray and wither_skeleton.

In other languages

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